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# rotateDigitalCrown(delta:velocity:)

Simulates the user rotating the Digital Crown on an Apple Watch by the delta amount and speed you provide.

```
func rotateDigitalCrown(delta rotationalDelta: CGFloat, velocity: XCUIGestureVelocity)
```

## Parameters

`rotationalDelta`

A float value that indicates the fraction of a full rotation of the Digital Crown.

`velocity`

A value that represents how fast to rotate the Digital Crown, in rotations per second.

## Discussion

Provide a positive value for `rotationalDelta` to indicate scrolling upward or a negative value to indicate scrolling downward, regardless of the orientation of the watch. A `rotationalDelta` value of `1.0` indicates a full rotation of the Digital Crown. Specify a `velocity` in rotations per second; the system ignores the sign of the `velocity` you provide.

---

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